Failed connections in Azure PostgreSQL

Question

Hello Team, We have a azure database for postgresql flexible server. On the metrics screen, we can see that there are a couple of failed connections (PFB the screenshot). But, there is no error message mentioned.

How to find out what is the error message or how to query any error logs in Azure PostgreSQL ? Regards, Nagesh CL

Answer 1

Hello Nagesh, In Azure Database for PostgreSQL, you can access error logs which often contain details on why connections may have failed. Here's a general outline of how you can query error logs in Azure PostgreSQL to find out the error message related to failed connections: Azure Portal:

• Navigate to your PostgreSQL server in the Azure portal.
  • Select "Server logs" under the "Monitoring" section.
  Azure CLI:
  • You can use the Azure Command-Line Interface (CLI) to list and download the logs. You would typically use az postgres server-logs commands.
• Querying Logs Directly:
  • If you have configured your PostgreSQL server to write logs to a table, you can query this table directly. For example, you might query the pg_stat_activity or pg_log table, depending on your configuration.
• Log File Contents:
  • The log files will contain detailed information about the error which caused the connection to fail. You will typically look for lines that mention "FATAL" or "ERROR".
• Diagnostic Settings:
  • If you've set up diagnostic settings to send logs to Azure Monitor logs (Log Analytics), you can query the logs there.
• PostgreSQL Configuration:
  • Make sure that your PostgreSQL instance is configured to log connection failures. This is controlled by the log_connections and log_disconnections settings in your PostgreSQL configuration file.

Here's an example of a command you might use with the Azure CLI to list the logs:

shCopy code
az postgres server-logs list --resource-group [ResourceGroupName] --server-name [ServerName]

And to download a specific log file:

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az postgres server-logs download --name [LogFileName] --resource-group [ResourceGroupName] --server-name [ServerName]

Please replace [ResourceGroupName], [ServerName], and [LogFileName] with your actual resource group name, server name, and the log file name you wish to download. Remember that the exact commands and steps may vary based on your server configuration and the version of PostgreSQL you are using. Always refer to the most recent Azure documentation for the most accurate and up-to-date information. If you cannot find the information you need in the logs, you may need to adjust your logging level to capture more details about connection attempts. It's also a good practice to review any changes in firewall rules, connection strings, or authentication methods that might be causing connection issues. If the answer helped, or pointed you in the right direction, please click accept answer or please share more information to help you better.